| In recent years,strong demand for the marketn,Heilongjiang reclamation area began to try to grow peas in recent years.Due to lack of technical support,pea production is not high.This experiment aims to study the optimal sowing date,density,and fertilization amount of cold-season peas in Heilongjiang and improve the pea production level in the glutinous area.The experiment was conducted at Heshan Farm in Heilongjiang in 2017.Three factors were used in the re-cracking test design.The main area was fertilization,the split area was density,and the re-cracking area was sowing date;the pea variety was selected to be British big peas and the beans special fertilizer was Yuntianhua's production.Through different fertility(75 kg·hm-2,150kg·hm-22 and 225 kg·hm-2),density(225,000 plants·hm-2,375,000 plants·hm-22 and525,000 plants·hm-2)and sowing dates?April 23,May 8 and May 23?to study the effects of different treatments on the growth,agronomic traits,photosynthetic characteristics,Material accumulation,nitrogen content in various organs and yield.The main results are as follows:1.In all the treatments,the top 10 combinations of production were mostly high-fat,medium-fat and high-density and medium-density combinations,indicating that the high yield of pea was obtained under a certain fertility and density.The highest yield was F3M2B2?225 kg·hm-22 for special leguminous crops and375,000·hm-22 in density for sowing on May 8?,reaching 2782.26 kg·hm-2,significantly higher than other treatments.2.The leaf area index of different treatment combinations showed a single peak curve,and the maximum value was reached at the time of pods.With the increase of fertilizer application and planting density,the leaf area index also showed an upward trend;The leaf area index of medium-seeded peas can be maintained at a higher level for a long time.3.The accumulation of dry matter in the upper part of the pea was increased with the growth of the growth period,and the accumulation and distribution of dry matter in pea plants could be well coordinated by different treatment combinations.In the pea production,selecting the right sowing date,ensuring adequate fertility and proper density can improve dry matter accumulation of the top part of pea and further improve the yield of pea.4.The nitrogen content of the stems and leaves in the whole growth period of pea treated with different fertility,density and sowing time decreased,and the nitrogen content of the stem was always lower than that of the leaves.The rate of nitrogen content in grain was significantly higher than that of other organs at the later stage of growth.5.With the delay of sowing date,the growth period of pea gradually shortened,which was mainly reflected in the branching period to the bud stage.The days of early sowing,mid sowing and late sowing were 24d,20d and 14d respectively.6.Different fertility,density,and sowing date treatments affected pea production,photosynthetic traits,and their constituent factors.Correlation analysis was obtained:seeds per plant,100-seed weight,biological yield and leaf area index were all significantly or extremely significantly positively correlated with pea production. |
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